package com.tajiang.leifeng.utils;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import java.util.Random;

/**
 * Created by ekikousei易皇星 on 16/11/21.
 * E-mail:13764664731@163.com
 * Signature:缘分是本书,翻的不经意会错过,读的太认真会流泪!!
 * <p/>
 * TODO:类描述:  用于图形验证码的工具类
 */
public class CodeUtils {

//    private static final char[] CHARS = {
//            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
//            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
//            'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
//            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
//            'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
//    };

	private static final char[] CHARS = {

			'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
			'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',

	};

	private static CodeUtils mCodeUtils;
	private int mPaddingLeft, mPaddingTop;
	private StringBuilder mBuilder = new StringBuilder();
	private Random mRandom = new Random();

	//Default Settings
//    private static final int DEFAULT_CODE_LENGTH = 6;//验证码的长度  这里是6位
	private static final int DEFAULT_CODE_LENGTH = 4;//验证码的长度  这里是4位
	private static final int DEFAULT_FONT_SIZE = 60;//字体大小
	private static final int DEFAULT_LINE_NUMBER = 3;//多少条干扰线
	private static final int BASE_PADDING_LEFT = 40; //左边距
	private static final int RANGE_PADDING_LEFT = 30;//左边距范围值
	private static final int BASE_PADDING_TOP = 70;//上边距
	private static final int RANGE_PADDING_TOP = 15;//上边距范围值
	private static final int DEFAULT_WIDTH = 300;//默认宽度.图片的总宽
	private static final int DEFAULT_HEIGHT = 100;//默认高度.图片的总高
	private static final int DEFAULT_COLOR = 0xDF;//默认背景颜色值

	private String code;

	public static CodeUtils getInstance() {
		if (mCodeUtils == null) {
			mCodeUtils = new CodeUtils();
		}
		return mCodeUtils;
	}

	//生成验证码图片  返回类型为bitmap 直接用imageview.setbitmap()即可
	public Bitmap createBitmap() {
		mPaddingLeft = 0; //每次生成验证码图片时初始化
		mPaddingTop = 0;

		Bitmap bitmap = Bitmap.createBitmap(DEFAULT_WIDTH, DEFAULT_HEIGHT, Bitmap.Config.ARGB_8888);
		Canvas canvas = new Canvas(bitmap);

		code = createCode();

		canvas.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR));
		Paint paint = new Paint();
		paint.setTextSize(DEFAULT_FONT_SIZE);

		for (int i = 0; i < code.length(); i++) {
			randomTextStyle(paint);
			randomPadding();
			canvas.drawText(code.charAt(i) + "", mPaddingLeft, mPaddingTop, paint);
		}

		//干扰线
		for (int i = 0; i < DEFAULT_LINE_NUMBER; i++) {
			drawLine(canvas, paint);
		}

		canvas.save(Canvas.ALL_SAVE_FLAG);//保存
		canvas.restore();
		return bitmap;
	}

	/**
	 * 得到图片中的验证码字符串
	 *
	 * @return
	 */
	public String getCode() {
		return code;
	}

	//生成验证码
	public String createCode() {
		mBuilder.delete(0, mBuilder.length()); //使用之前首先清空内容

		for (int i = 0; i < DEFAULT_CODE_LENGTH; i++) {
			mBuilder.append(CHARS[mRandom.nextInt(CHARS.length)]);
		}

		return mBuilder.toString();
	}

	//生成干扰线
	private void drawLine(Canvas canvas, Paint paint) {
		int color = randomColor();
		int startX = mRandom.nextInt(DEFAULT_WIDTH);
		int startY = mRandom.nextInt(DEFAULT_HEIGHT);
		int stopX = mRandom.nextInt(DEFAULT_WIDTH);
		int stopY = mRandom.nextInt(DEFAULT_HEIGHT);
		paint.setStrokeWidth(1);
		paint.setColor(color);
		canvas.drawLine(startX, startY, stopX, stopY, paint);
	}

	//随机颜色
	private int randomColor() {
		mBuilder.delete(0, mBuilder.length()); //使用之前首先清空内容

		String haxString;
		for (int i = 0; i < 3; i++) {
			haxString = Integer.toHexString(mRandom.nextInt(0xFF));
			if (haxString.length() == 1) {
				haxString = "0" + haxString;
			}

			mBuilder.append(haxString);
		}

		return Color.parseColor("#" + mBuilder.toString());
	}

	//随机文本样式
	private void randomTextStyle(Paint paint) {
		int color = randomColor();
		paint.setColor(color);
		paint.setFakeBoldText(mRandom.nextBoolean());  //true为粗体，false为非粗体
		float skewX = mRandom.nextInt(11) / 10;
		skewX = mRandom.nextBoolean() ? skewX : -skewX;
		paint.setTextSkewX(skewX); //float类型参数，负数表示右斜，整数左斜
//        paint.setUnderlineText(true); //true为下划线，false为非下划线
//        paint.setStrikeThruText(true); //true为删除线，false为非删除线
	}

	//随机间距
	private void randomPadding() {
		mPaddingLeft += BASE_PADDING_LEFT + mRandom.nextInt(RANGE_PADDING_LEFT);
		mPaddingTop = BASE_PADDING_TOP + mRandom.nextInt(RANGE_PADDING_TOP);
	}
}